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Income Taxes | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes (In Thousands) Significant components of the provision for income taxes are as follows for the periods presented:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Current |  |  |  |  |
Federal | $ | 22,658 |  |  | $ | 28,380 |  |  | $ | 31,679 |
State | 2,625 |  |  | 1,354 |  |  | 2,131 |
| 25,283 |  |  | 29,734 |  |  | 33,810 |
Deferred |  |  |  |  |
Federal | 13,369 |  |  | 22,314 |  |  | 10,480 |
State | 3,075 |  |  | 1,147 |  |  | 557 |
Revaluation of net deferred tax assets as a result of the Tax Cuts and Jobs Act | — |  |  | 14,486 |  |  | — |
| 16,444 |  |  | 37,947 |  |  | 11,037 |
| $ | 41,727 |  |  | $ | 67,681 |  |  | $ | 44,847 |
The reconciliation of income taxes computed at the United States federal statutory tax rates to the provision for income taxes is as follows, for the periods presented:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Tax at U.S. statutory rate | $ | 39,616 |  |  | $ | 55,955 |  |  | $ | 47,522 |
Increase (decrease) in taxes resulting from: |  |  |  |  |
Tax-exempt interest income | (1,433 | ) |  | (3,595 | ) |  | (3,467 | )
BOLI income | (975 | ) |  | (1,524 | ) |  | (1,622 | )
Investment tax credits | (1,863 | ) |  | (1,591 | ) |  | (1,390 | )
Amortization of investment in low-income housing tax credits | 1,592 |  |  | 1,873 |  |  | 1,742 |
State income tax expense, net of federal benefit | 4,502 |  |  | 1,626 |  |  | 1,747 |
Revaluation of net deferred tax assets as a result of the Tax Cuts and Jobs Act | — |  |  | 14,486 |  |  | — |
Other items, net | 288 |  |  | 451 |  |  | 315 |
| $ | 41,727 |  |  | $ | 67,681 |  |  | $ | 44,847 |
Significant components of the Company’s deferred tax assets and liabilities are as follows for the periods presented:
| December 31,
| 2018 |  | 2017
Deferred tax assets |  |  |
Allowance for loan losses | $ | 14,097 |  |  | $ | 13,966 |
Loans | 18,655 |  |  | 15,062 |
Deferred compensation | 10,001 |  |  | 7,093 |
Net unrealized losses on securities | 6,180 |  |  | 3,659 |
Impairment of assets | 1,280 |  |  | 1,748 |
Net operating loss carryforwards | 19,065 |  |  | 2,419 |
Other | 3,610 |  |  | 4,722 |
Gross deferred tax assets | 72,888 |  |  | 48,669 |
Valuation allowance on state net operating loss carryforwards | — |  |  | — |
Total deferred tax assets | 72,888 |  |  | 48,669 |
Deferred tax liabilities |  |  |
Investment in partnerships | 1,572 |  |  | 757 |
Depreciation | 3,865 |  |  | 3,163 |
Mortgage servicing rights | 12,350 |  |  | 10,139 |
Subordinated debt | 1,607 |  |  | 2,394 |
Other | 1,792 |  |  | 1,859 |
Total deferred tax liabilities | 21,186 |  |  | 18,312 |
Net deferred tax assets | $ | 51,702 |  |  | $ | 30,357 |
The Tax Cuts and Jobs Act (the “Tax Act”), enacted on December 22, 2017, among other things, permanently lowered the statutory federal corporate tax rate from 35% to 21%, effective for tax years including or beginning January 1, 2018. Under the guidance of ASC 740, “Income Taxes” (“ASC 740”), the Company revalued its net deferred tax assets on the date of enactment based on the reduction in the overall future tax benefit expected to be realized at the lower tax rate implemented by the new legislation. After reviewing the Company's inventory of deferred tax assets and liabilities on the date of enactment and giving consideration to the future impact of the lower corporate tax rates and other provisions of the new legislation, the Company's revaluation of its net deferred tax assets was $14,486, which was included in “Income taxes” in the Consolidated Statements of Income for the year ended December 31, 2017. No further adjustments related to the Tax Act were required in 2018. The Company and its subsidiaries file a consolidated U.S. federal income tax return. The Company is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ending December 31, 2015 through 2017. The Company and its subsidiaries’ state income tax returns are open to audit under the statute of limitations for the years ended December 31, 2015 through 2017. The Company acquired federal and state net operating losses as part of its previous acquisitions, with varying expiration periods. The federal and state net operating losses acquired in the Brand acquisition were $83,960 and approximately $67,168, respectively, all created in 2018. As part of the Tax Act and corresponding state tax laws, the federal net operating losses and the majority of the state net operating losses created by Brand during 2018 have an indefinite carryforward period. As of December 31, 2018, there are federal and state net operating losses, related to the Brand acquisition, without expiration periods of $71,963 of and $63,218, respectively. The federal and state net operating losses acquired in the Heritage acquisition were $18,321 and $16,877, respectively, of which $4,956 and $2,365 remain to be utilized as of December 31, 2018. These losses begin to expire in 2029 and are expected to be fully utilized. Because the benefits are expected to be fully realized, the Company recorded no valuation allowance against the net operating losses for the year end December 31, 2018. The table below presents the breakout of net operating losses for the periods presented.
| December 31,
| 2018 |  | 2017
Net Operating Losses |  |  |
Federal | $ | 76,919 |  |  | $ | 5,920 |
State | 65,583 |  |  | 7,319 |
A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest, related to federal and state income tax matters as of December 31 follows below. These amounts have been adjusted for the change in the tax rate from 35% to 21%.
| 2018 |  | 2017 |  | 2016
Balance at January 1 | $ | 1,606 |  |  | $ | 1,510 |  |  | $ | 1,485 |
Additions based on positions related to current period | 313 |  |  | 467 |  |  | 25 |
Reductions due to lapse of statute of limitations | — |  |  | (371 | ) |  | — |
Balance at December 31 | $ | 1,919 |  |  | $ | 1,606 |  |  | $ | 1,510 |
If ultimately recognized, the Company does not anticipate any material increase in the effective tax rate for 2018 relative to any tax positions taken prior to January 1, 2018. The Company had accrued $244, $169 and $169 for interest and penalties related to unrecognized tax benefits as of December 31, 2018, 2017 and 2016, respectively.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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